I have tried it on an HTC evo running 2.2 and a galaxy Tab also running 2.2 FROYO

I have tried it in the stock browser and Dolphin w the same results
on the demo it doesnt display anything when you press get image, the reset button works fine tho.

I couldnt figure out how to send the image as part of the form so i created a textfield and made it hidden and when you press sumit it pushes the signature to this hidden field then form.submit runs and when you un hide it it only says "data: ," below is my code that i use to fill that hidden field